By oversight I have wrongly filed GSTR3B for Mar'18 i.e IGST short payment of Rs.600/-(In Both Outward supplies & Payment shown short) Please let me know what steps I have to take now to correct the same.
13 May 2018
You should file the correct GSTR 1. Write a letter to your concerned officer after filing the GSTR 1 explaining the mismatch in both the returns